Unit and multiple door operator



Jlme 1945- A. E. WEIGELE 2,377,986

UNIT AND MULTIPLE DOOR OPERATOR Filed July 15, 1943 11 Sheets-Sheet l INVENTOR HLBERT EJNEIGELE QQL EWL ATTORNEYS June.l2, 1945. A. E. WEIGELE UNIT AND MULTIPLE DOOR OPERATOR Filed July 15, 1943 11 Sheets-Sheet 2 INVENTOR ALBERT E. wElGELE ATTORNEYS June 1211945. wElGELE 2,377,986

UNIT AND MULTIPLE DOOR OPERATOR Filed July 15, 1943 ll Sheets-Sheet 3 v INVENTOR HLBERT a. WEIGELE ATTORNEYS June 12, 1945.

A. E. WEIGELE 2,377,986

UNIT AND MULTIPLE DOOR OPERATOR Filed July 15, 1943 ll Sheets-Sheet 4 INVENTOR HLBERT E. WEIGELE.

QMLHQN ATTORNEYS June 12, 1945. A. E. WEIGELE 2,377,986

UNlT AND MULTIPLE DOOR OPERATOR Filed July 15, 1943 11 Sheets-Sheet s INVENTOR ALBERT E. WElGELE ATTORNEYS June 12, 1945. A. E WEIGELE 7 UNIT AND MULTIPLE DOOR OPERATOR Filed July 15, 1943 ll Sheets-Sheet 6 INVENTOR HLBERT E. WEIGELE ATTORNEYS June 12, 1945. A, w l E 2,377,986

unrr m MULTIPLE noon OPERATOR Filed July 15, 1943 ll Sheets-Sheet 7 FILEL7 Flu-.8

L I INVENTOR HLBERT E. wEmELE ATTOR N EYS June 12, 1945. wElGELE 2,377,986

UNIT AND MULTIPLE DOOR OPERATOR Filed July 15, 1943 ll Sheets-Sheet 8 INVENTOR HLBERT E. WEEGELE ATTORNEYS June 12, 1945.

A. E. WEIGELE UNIT AND MULTIPLE DOOR OPERATOR 11 Sheets-Sheet 10 Filed July 15, 1943 vJune 1945. A. E. WEIGELE 2,377,986

UNIT AND MULTIPLE DOOR OPERATOR Filed July 15, 1943 ll Sheets-Sheet l1 INVENTOR. ALBER T E. WE'IGELE AHHS.

Patented all 12, 1945 UNIT AND MULTIPLE noon oraaa'roa Albert E. Weigele, Newark, N. 1., assignor to National Pneumatic Company, New York, N. Y., a corporation of West Virginia 1 Application July 15, 194:, Serial No. 494,767

Claims. (01. 189-8) This invention relates to door operatin systems. g

The general object of the invention is to provide a door operating system by meansof which a plurality of doors may be controlled so that each individually may be power opened and power closed, or two or more of the group may be power opened and power closed, and including means whereby the doors which are normally locked may' be individually unlocked and opened by hand.

Themany detailedobjects herein disclosed in combination with the above general object will be better understood from the following detailed description of the embodiment oi the invention illustrated in the drawings. For this reason an extended list of detailed objects will not be separately given.

This invention resides substantially in the combination, construction, arrangement and relative location of parts, all as will be described in detail below. I

In the accompanying drawings in which the same parts will be given the same reference numerals throughout the various views,

Figure l is a front elevational view, of the operating mechanism associated with a single door, but which is duplicated for each of the doors of the group:

Figure 2 is an enlarged front elevational view of a portion of the mechanism illustrated in Fig- .ure 1, showing some parts removed or in crosssection; illustrating the-parts in normal door closed and locked position;

Figure 3 is a simplifledview of the mechanism associated with one door with some parts in cross'section: illustrating the position of the parts when the door is moving to open position under power;

Figure 4 is aview similar to Figure 3 showing the door closed and locked but with the parts in position for manually unlocking and open- Figure 5 is a view similar to the last figure but differing in that the manual operationhas Figure 7 isa cross-sectional view, taken on 'the'line 1-1 of Figure 2;

Figure 8 is a cross-sectional'view taken on the lineHoiFlguroz;

Figure 9 is a cross-sectional view taken on the 1 line 9'-9 of Fiflure 2; 1

Figure 10 is a longitudinal, central, cross-sectional view of the manually actuated unlocking mechanism;

Figure 11 isv a longitudinal, central view through the motor control valve:

Figure 12 is an elevational view thereof; Figure 13 is a side elevational view of the emergency lever; I

Figure 14 is afront elevational view of a portion of the operating handle broken away; 9 Figure 15 is a diagrammatic and schematic illustration of the control system for the engines of two doors; and Figure 16 is a perspective view of three of the cooperating levers forming part of the control mechanism.

The subject matter herein disclosed has been specifically designed for applicati'on'to the operation of prison cell doors, but from the following description it will become apparent that it is not limited to such use, but can equally well be applied to the operation of door groups for other types of closures. As will appear from the description as it proceeds, the mechanism has been devised to provide great flexibility in the operation of a plurality of doors in a group either singly or as a unit or in any desired subcombinations of the complete group while insuring against unauthorized opening and providing protection against faulty operation in an emergency.

' There is illustrated in Figure l the mechanism associated with its door and duplicated for each door. The invention has been illustrated as applied to a prison cell and the grating front of the cell and the door frame are diagrammatically illustrated at l. The wall above the door appears at 2 and lying between the grating and the wall is a casing l which is closed at the front by means of a sectionalized removable cover 3'. Each cover panel upon removal exposes the-mechanism for one door and'when in place Protects it against tampering. The door 4' is mounted from above on roller hangers i so as to have a sliding movement with respect to the cell front. Attached to one of the hangers, as is clear from Figureil, is a bracket-to which the piston rod 1 of a pressure fluid operated diflerential engine 8 mounted above I(fihe door is attached. An engine of this types table for the purpose with some obvious modifications is shown in United States Patent No. 2,089,932 granted August 17, 1937. At 9 is the pressure fluid supply line from any suitabl source which extends throughout the cell bank and is provided at each engine with branch connections 10 permanently connecting the center of the en gine 8 with therfluid supply source, as is usual in the case of difi'erential engines of this type. The Y branch l also extends to the pressure fluid supply connection of an electro-magnet valve II which has not been illustrated here in any detail since it is very well known in this art. An example of a suitable construction for a valve-of this type is illustrated in full detail in United States Patent No. 1,849,516 at Figure 38.

The fluid delivery line l2 from the valve when actuated extends to the locking cylinder II which comprise no more than'a cylinder having a Diston therein with a spring normally holding the piston to the right, Figure 2, so that the piston rod is withdrawn into the cylinder, as illustrated in Figure 2. Pressure pipe 9 is provided with a branch connection It extending to the engine control valve E5. The valve when in normal position (Figure 11) supplies fluid pressure through the branch It to the right hand end or the engine 8. The exhaust port of the valve I6 is connected by the branch ll to the exhaust line I3. In a system of this type it is desirable to conduct the exhaust of the engines to some remote point rather than to permit its discharge directly into the atmosphere. Thus the exhaust connection I! is provided for the equipment. The details 01 valve I are shown in Figures 11 and 12., The {pressure S pply Pipe I4 :connects to the port M of the valve which in tum is connected through the valve body to the port ll 0: the

valve to/which the supply pipe I is connected. The movable valve member 34 is'norinally held in.

the position shown in Figure ll by reason or the spring to maintain this connection until the movable valve member 34 is moved upwardly by applying pressure to operator 32, when the connection between pipes l4 and I3 is cut ofl and pipe I6 is opened to exhaust through the port H to which the exhaust connection I! is made. 3 Supported over the door in any suitable manner are a pair of brackets l3 and 23 in which is mounted for longitudinal sliding movement, a bar 2| which has a hole 22 near one end adapted to register with the hole 23 in the bracket I! when the bar 2| moves to the right. This bar is Provided with a bracket 24 which is pivotally connected by the link 25 to one end of a double ended lever 26 (see Figure 2). The other endot this lever is pivotally connected to a rod 21 which runs along the cell bank so as to interconnect all of the levers 26 of the bank and to connect with the emergency lever ofFigures 13 and 14 positioned at one end of the bank. Reference to this feature will be made later. As appears best from Figures 'l, 8, 9 and 10, the double ended lever 26 is provided with a forwardly extending cup formatom of the cup in an eccentric position. The lever 26 is pivotally mounted on a sleeve supported in the housing 23 within which is mounted the valve l5 and other mechanism shortly to be described (see also Figure2) At this pointit will be noted that the key K can be passed through the holes 22 and 23 when they register so as to project into the cup 23' and engage the complementarily shaped end oi the shaft 44 to hereferred to later. Theremovable panel 3' has a hole therein which always registers with the hole 23.

seen that the forward door hanger bracket is Referring to Figure 2, tor example, it will be.-

provided with a forwardly extending latch bar 23 which when in door closed position, as illustrated in Figure 2, is engaged by the vertically reciprocable latch 33 which slides in a guide 30 having the housing 28. The compression spring 3| tends to hold the latch 33 in its latching position, as shown in Figure 2. At this point it will be noted that the latch 33 is positioned so that it may engage the operator 32 of the valve It.

The piston rod of the lock cylinder I3 is pivotally congected to a link 35 which in turn is attached to a bracket 33, which in turn is pivotally connected to the upper end of the lever 31. This lever has a short lateral extension 31' and is pivotally mounted upon a shaft 38 mounted in the housing 28, all as is quite'clearly illustrated in Figures 9 and 10. Pivotally mounted on the shait 38, adjacent the lever 37, is a bell crank lever one arm 38 of which engages a radial slot in the 20 upper end of the latch 33. The lever 39 is provided with a pair of lateral extensions 33' and 38" lying on opposite sides thereof, as is clear from Figure 9, oneof which 39 is positioned to be engaged by the short lateral lever 3'! and the 25 other of which is positioned to be engaged by a lateral extension 4| on a lever 4!, also pivotally mounted on the shaft 33. The outer end of the arm H is right angled, as shown at 42. The other arm 40 of the bell crank lever extends in a 30 generally downward direction, as will be seen from Figures 2 to 6 inclusive, and is arranged to engage the roller on the endof lever 43. The lever 43, asis clear from Figure 10, is secured to the shaft 44.- The key end of the shaft is provided with a 35 peripherally notched disc which appears in several figures and positioned to cooperate with the pin 26". An overcenter spring operated toggle 43 is provided for the lever 43 to cause snap action and positioning thereof in accordance with well known principles for devices of this type.

It is of interest to note, as is clear for example from Figure 2, that the lever has a pair of oppositely extending wings arranged to cover the slot in the housing 28 in which the arm operates 45 and to maintain the slot closed at all times so that tampering with the equipment at this point is prevented. v

On a stud 41 are pivotally mounted a pair of supports for the mercury switches 43 and 43. 0 The support for. the switch 48 has a downward extension 43' positioned to be engaged by an adjustable actuating screw 6' mounted on the upper end of the bracket 3 by means of which the engine is connected to the door. The support for the switch 43 likewise has-an extension as shown at 43' positioned to be engaged by the bent and 42 of the lever 4|. The supports for both of these switches are provided with springs and are shaped for cooperation with a fixed stop, as shown, to

limit their counterclockwise rotation under the tion 26' and with a pin 28" mounted at the botaction of the springs. These switches are included in circuits to be shortly described. These circuits. in part at least, extend to the terminal board shown adjacent the switches in Figure 2;

. Referring to Figures 13 and 14. there is illustrated the emergency lever which is to be mounted at either end of the cell bank within a cabinet, diagrammatically illustrated .at LB in Figure 15. which may be locked against tampering. This de- 7 vice includes a suitably shaped support It upon which the manually actuated lever I3 is pivotally mounted at U. Integral with the lever is an ex-- 19 and 80.

levers 26. The lever 53 includes a latch bar 54 which may be given longitudinal movement by means of a finger button 56 adjacent the handle of the lever 53. This latch cooperates at 54 with the notches formed on the support as indicated at 55. Thus the lever may take three different positions which may be termed for purposes of description normal position, first emergency posimoved the mercury switch may be tilted from an off position to an on position and vice versa.

The piping and wiring diagram is shown in Figure for two doors. At a central control station, probably at the end of a cell bank and adjacent the emergency lever, is a door control panel diagrammatically illustrated at PB in Figure the doors. Withthe lower blade of each switch m-the .position shown the other blade is in door closed position so that in order to open each doorindividually the upperblade will be moved from the position shown that is, to door open posi-' tion of the operator to engage the upper contact so that each door can be opened individually. When the upper bladeis returned to the position shown the door will close provided the group switch is open. In order to disconnect any switch and associated equipment from group control the lower blade of theswitch is moved to open position that is to door closed position of the operator whereupon the control of thegroup switch thereover is interrupted. Thus the' operator for the individual switches can take three positions to accommodate the operating positions of the when the door is closed. One terminal of this switch is connected, as illustrated, to the positive side of a current source by the supply lead Ill. The other terminalof this switch is connected by the wire' 12 to one side of the emergency signal lamp controlled by the switch and to a wire 9|. The other side of the lamp 13 is connected by wire H to one terminal of the switch 59 mounted on the emergency lever. When this lever is in normal position'thi switch is open. The other contact of the switch is connected by Wire 15 to the negative side of the'current source through the supply lead 16. The group control switch is shown at 11 and is connected at one side to the supply lead 10. The other side is connected by wire 18 to one of the switch blades of each switch The otherjswitch blade of each switch isconnected by wire 88 to the positive side of the current source; The fixed contacts of the switches 19 and 80 are respectively connected by the wires 88 and 83 to one terminal oi the wind-.- ing of the corresponding magnet valves II. The other terminals of the windings of these valves are connected to the .wire 85,. which is directly connected to the supply lead 16.

switches. These positions would be the group position, which is the position shown, and the door open position inwhich each blade engages its contact and door closed position in which each blade is out of contact as described above.

The flexibility of this system will b apparent from the following description oi the several ways in which the equipment may be operated to open and close the doors individually or in desired groups by means of power, and individually unlocked and opened, and. closed manually.

Before describing these operations in detail a few general observations will be helpful. emergency signal light 13 is illuminated when the energency lever 53 is in the first emergency and in the full emergency positions. The panel box door operated switch Il is so arranged that when the door is closed the switch opens its contacts making the signal light system inoperative and extinguishing all-signal lights. When the in their door closed positions all door' control switches are dead and there is no possible way of operating the doors except from the control cabinet or by means of the emergency unlocking lever 53.

1 closed and locked. In a practical installation us- Positioned adjacent eachindividual switch are lamps. .For example, as illustrated, there is the lamp 8| for the switch 19, and 02 for the switch ll. One side of each of these lamps is connected by the common wire 89 to the current lead 16. The other lead of lamp I2. is connected by wire 90 to the mercury switches 48 and 49;which in turn are connected in series and back to the would control both door engines to open and close l ing air unde'ra pressure of 85 pounds per square inch when opening the doors the engines each exert an actual pull of 2%5 pounds which efl'ectively prevents holding a door closed by hand. During the closing the engines exert a pressure of about 25 pounds preventing injuries to one if caught by the doors. Cushioning devices are pro-' vided to prevent slamming on opening'and closins.

The normal condition of the system In the normalcondition of the system all doors are closed and locked. To obtain this condition the apparatusis positioned as followsi 1. The emergency, unlocking and control lever 53 isin its normal position, extreme left. As a result the keyholes 22 in the bars 2! are out of alignment with the keyholes 23 in-the-brackets I9 and the bars 2| are locked in that position so that the system cannot be operated by means of keys.

2. All individual switches 19 and should be in their group position which is the position shown in Figure 15. a

3. The group switch 11 must be in door closed position which is the position shown in Figure 15,

panel cabinet is closed and the door of the control and locked.

The

Under this condition the doors are alli To open any individual cell door 1. The emergencylever I3 is in normal position. 2. Th control cabinet is unlocked and its door is opened. Each of the lights II and 33 positionally associated with the switches I3 and respectively should light up when the cabinet door is opened. If one or more of these lights are not energized it is at once necessary to investigate the condition of the cell doors and locking system to determine whether they have been tampered with.

If everything is in n ormal position these lights will be illuminated through the following circuits, From wire 10 through switch 1| which closes when the door of the cabinet is opened, to, wire 9|, through the closed switches 43 and 49 at each door, and back by the wires 33 and IE3 through the respective lamps 32 and: 3|, to the common lead 89 back' to the circuit wire 16. It the mechanism has been tampered with to the extent that one or the other of the switches 43 and 43 of one or-more doors have been opened the corresponding light 8| and 82 at the panel will not be energized. At this .point it will be well to recall that the above and following description contemplates that the various circuits and operations described will be duplicated for as many doors as may be desued in a cell block or group.

3. The individual switch 13 or 33 corresponding to the cell doorto be individually opened is moved to door open position energizing the corresponding door lock magnet valve II to supply air to the lock cylinder I3. This is accomplished by moving the switch operator to door open position which moves the upper blade of switch 19,

' causing through the link 35, the lever 31 to move from the normal position shown in Figure 2 to the position shown in Figure 3. Its extension 31' engages the adjacent wing 33' 01' lever 33 (see Figure 9) raising arm as, which in turn hits the latch 33 to the position shown in Figure 3 and compresses spring 3|. At th upper end of the movement of latch 33 the operator 32 01 the door engine control valve I! is operated to disconnect fluid through the valve II to pipe l3 and to connect pipe IE to exhaust through the valve II and branch I! to the exhaust line l3. Thus the large or right hand end of cylinder 3, Figure 1, is connected to atmosphere while. of course, the pressure fluid connection through the branch 13 is maintained. The result is that he Pi ton will move to the right withdrawing the piston rod 1 into the cylinder and pulling the door 4 open.

4. As the door was unlocked by the upward movement of latch 33, the extension 33", Figure 16, on the lever 39 engaged under the lateral extension 4|' on the lever 4| also raised that lever so' that its bent end 42 engages the lug 43' of switch 49 tipping it to the position shown in Figure 3 and extinguishing the associated signal lamp 3|, indicating that the door is unlocked. As the door opened the screw 3' back freeing the lug 43' so that switch 43 also moved from the closed position in Figure 2 to the open position in Figure 3 further breaking the circuitto the same signal light.

5. In order to close this door which has been opened, switch 19 is moved back to the position shown, breaking the circuit to the magnet valve so that the lock cylinder I3 is opened to exhaust, whereupon the spring in thecylinder will return lever 31 to normal position and aided by spring 3| to return also the latch 33 to latching position, whereupon valve l5 returns to the position shown in Figure 11, so that the right hand end of the large cylinder of engine 8 is cut oil! from exhaust and connected to the pressure line 9, whereupon the engine will close the door. The return of lever 31 to normal position permitted lever 4| to fall back to normal position so that the switch 49 controlled by it closes. Asthe door closes and moves into latched position, screw 6' will operate the switch 48 to close it, so that light 8| will again be energized indicating that the door is both closed and locked. The shape of the latching bar 29 secured to the door is such as to ride the latch 33 up on its end until it snaps into the seat provided for it. It will be noted that the signal light associated with each individual door will not be energized until the door is both fully closed and locked. Only in the open.

S pp y P pe 3 to shut'ofl the supply oi pressure on the bracket 3 moved event that both of these conditions exist will the light be energized. At any time during either the opening or closingof' the door the operator may be manipulating the individual switch, stop the novement of the door and cause it to close or To close any single door that was i reuiouslu opened with individual control 1. The emergency locking lever 53 is in normal position.

2. The group switch 11 must be in door closed position as shown. I

'3. The panel cabinet door is unlocked and opened.

4. All individual lights 8!, 32 should be illuminated for the doors supposed to be closed and darkened for the doors supposed to be open.

5. The operator moves the indivldualswitch 14 or In to its group position, de-energizing the door lock magnet valve'l I as previously described.

It in turn exhausts air from the door lock cylinder and the spring loaded latch bolt 33 returns to door locked position. This allows the door engine valve IE to connect pipe II to the pressure supply'so that pressure fluid is allowed to enter the larger cylinder of the engine causing the door to close. As before locking occurs by raising the latch bolt against the spring 3| which snaps back to locking position at the right time. As before the switches 48 and 49 ultimately close to energize the individual light or 8|, indicating completion of the operation.

6. If the operator during the closing of the door returns the individual switch to door open position, the door will reverse and open.

To close any single cell door that was previously opened by a group control should be illuminated-while the other should be darkened. 4. The doors supposed to be open will then be individually closed by operating individual l lights 8,4. and 82 will darken.

switches It and III to door closed position to close the door as previously described.

5. The operator may during closing ofany door return the individual switch to group posi-' tion to cause the door to re-open.

To open any group of cell doors or all cell doors simultaneously 1. The emergency unlocking lever 53 is in normal position. v

2. The control panel cabinet is unlocked and opened.

3. It all the doors are to be opened all the individual switches 18 and 80 must be in their gr up position which for reminder it is noted is the position shown in Figure/15. If, however, it is de- I are in group position, to open. For this function a circuit is completed from wire 10 through closed switch 'I'I"(its door open position), through wire I! and through the lower blade of each individual switch in group position by wires 83 and 88 to the-corresponding magnet valves and back by wires 84 and 81 to wire 85, and thence to wire As these doors unlock the corresponding 6. Ii (the operator returns to door closed position, that is opens it, all of the doors will close. The same result follows if switch 11 is opened while the doors are opening, that is they will stop and move back to closed position.

To close any group of cell doors or all cell s simultaneously when the doors were opene y roup control 1. The emergency locking lever 53 is in normal position.

2. The operator unlocks and opens the control panel cabinet.

. switches are operated to door open position.

4. After setting the individual switches the opthe group switch 3. It any doors are closed and must remain closed the individual switches for these doors must be in door closed position.

4. The group switch 11 must be placed in door open position.

5. The individual switches for doors to be closed are then placed in their group positions.

6. The operator places the group switch 'I'I inthe door closed position and the doors selected will close simultaneously.

7. The corresponding lights for all selected doors to be closed will be illuminated as each door cloQes andlocks. If this doesnot occur irregular operation is indicated.

8. ll the operator returns the group switch to door open position while the doors are closing, or after they have closed-they will open.

Reversal of doors 1. If the cell doors are moving under the control of the group switch theoperator can reverse any individual door by moving the indivldual switch to the position opposite to the movement of the group.

2. It the cell doors are moving under the control of the group switch they can all be reversed by reversing the position of the group switch.

3. Any cell door moving under individual control can be reversed by reversing the position of the individual switch.

Emergency unlocking control lever This lever .has three positions as previously mentioned. Normal and -first emergency and full emergency positions successively. 1. When the emergency unlocking control lever is in normal position the doors can only be controlled from the control panel. At this time the keyholes are all covered.

2. When the emergency unlocking control lever 53 is in the first emergency position all doors are locked but the keyholes are uncovered and the special key K can be inserted. This results from the fact that as the lever 53 is moved to first orator places the group switch 11 in door closed position, that is he opens it and all or the selected doors close simultaneously. s

5. {I'he individual lights at and 82 will be i1 luminatcd as each door *'is closed and locked.

Those that do not so illuminate should be in vestigated to determine the cause.

6. If the group switch 11 is returned to door open position all.the doors will reverse their movement and open during closing as well as when fully closed.

To close any group of cell doors or all cell doors simultaneously when the doors are opened by individual control opens the control emergency position the connection 21 to the upper end of lever 52 (see Figure 13) shifts the bars 2| to the right (Figure 1) to align the pairs of holes 22, 23. 11' the air pressure system is in normal operating condition the doors will open when they are individually unlocked by means of the key. The alignment of the pairs of holes 22, 28 is illustrated in Figure 4. 'All the parts are otherwise in normal door closed and locked position. when the key is inserted and turned as illustrated in Figure 5, the lever 43 is' moved to the right and engaging arm 40 of the bell crank as it does its other arm 39 is raised unlatching the door. Continuing the operation by means of the key to the position shown in Figure 6 the latch 33 is raised to the point where valve i5 is operated and switch 49 is opened. The operation of valve l5 exhausts the engine and the door will open under power. As it opens, of course, switch 48 also opens. plate and the pin 26" limit the movement of the parts as eflected by the key K in an obvious reason the doors can be opened by hand when the parts have been moved to the position shown by Figure 6, which movement is suflicient only to unlock the doors. It will'be noted, of course,

thatwhile' the operation of the lever 53 has shifted all the bars 2| to align the hole pairs 122", 22, the doors are individually operated by the key. v

The notched 6 aarmae As soon as the emergency lever it was moved from normal position to either emergency position,'switch closed, see Figure 15, to energize the emergency light and keep it energized, indicating that the lever is out of normal position. It will bev seen .then that with the lever I! in first emergency position each door may be individually unlocked and locked, opened and closed by hand it there is no air, or opened and closed ;by power if the air system is in operating com dition.

- When the lever 53 is in full emergency position a locking device, not shown, is unlocked to permit the removal of the cover panels 8' so that access to the'equipmentof each door may be had for authorized purposes. Only when the lever 53 is in full emergency position is it possible to remove these cover panels. At this time all doors are unlocked because pin 26." engages the end 01' the notch in plate 4! and thusturns the shaft '44 to unlock position.

a. when the lever u is placed in muemere ge'ncy position andv then returned to first emergency position all doors will be unlockedbecause spring 48 keeps shaft 4 in the position to which it was turned by pin 28" in full emergency position and the hole pairs will be aligned. The

' panel fronts will be locked inplace andthe doors may be individually locked: with the key K. In

order to lock all the doors the emergen y lever 53 must be placed back in normal position.

From the above description it will be apparent to those skilled in the art that the subject matter of this invention iscapable of considerable variation without departing from the novel combinations and functions herein disclosed. I do 'not. therefore, desire to be strictly limited to the disclosure as given herein but rather only as required by the claims granted me. What is claimed is: 1. In a door control system a plurality of doors, engines respectively connected to said doors. means for'locklng-each of said doors in closed position, individual engine control devices, individual lock' control devices, said locking means individually actuating the respective engine control devices, sources of energy for said engines and lock control devices and group control devices cooperating with said lock controlling devices whereby the doors may be selectively unlocked, and opened and closed and locked individually, as a group or as sub-groups.

2. In the combination of claim 1, said engines being difierential fluid pressure engines and said lock control devices being pressure fluid operated.

3. In the combination of claim 1, said engines being diiferential fluid pressure operated engines .supplied continuously with pressure fluid when vices cooperating with the doors and lockin .meansto indicate when the doors are closed and loked and when they are unlocked and/or open.

. ALBERT E. WEIGELE. 

